A control method of a dual-function red water cooling and cold storage magnetic suspension unit

Abstract

This application relates to a control method for a dual-function red water cooling and cold storage magnetic levitation unit, comprising a magnetic levitation compressor, a condenser, a red water falling film evaporator, a cold storage falling film evaporator, a red water pool, and a cold storage water tank. The magnetic levitation compressor, condenser, and red water falling film evaporator constitute a first refrigeration circuit; the magnetic levitation compressor, condenser, and cold storage falling film evaporator constitute a second refrigeration circuit. The red water falling film evaporator and the red water pool form a red water circulation circuit; the cold storage falling film evaporator and the cold storage water tank form a cold storage water circulation circuit; the two circuits are connected by a controllable interconnection structure. The control method includes: when the red water pool requires high-temperature disinfection and cleaning, the first circuit is closed, the red water falling film evaporator is stopped from cooling and cleaning is performed; during cleaning, the second circuit is opened to pre-store cooling in the cold storage water tank; after cleaning, low-temperature water from the cold storage water tank is introduced into the red water circuit for rapid cooling. This method resolves the conflict between disinfection and cooling, shortens downtime, and improves production efficiency and energy utilization.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and more specifically, to a control method for a dual-function red water cooling and cold storage magnetic levitation unit. Background Technology

[0002] In the poultry slaughtering and processing industry, the red water (a mixture of blood, grease, and impurities) generated after slaughter needs to be cooled to clean and pre-cool the poultry. Traditional red water cooling systems typically use open-type ammonia screw chillers, such as those from brands like Iceberg and Snowman. While these systems can meet basic cooling requirements, they suffer from the following technical drawbacks in practical applications:

[0003] Firstly, the conflict between high-temperature disinfection and cleaning and the refrigeration function leads to poor production continuity.

[0004] The red water system requires regular high-temperature disinfection and cleaning during production to kill bacteria and remove blood and grease residues adhering to the pipes. During high-temperature cleaning, the water temperature in the red water tank rises sharply to over 60°C. After cleaning, the system needs to restart its cooling mode to lower the water temperature to the required low-temperature range (usually around 1°C) before the next batch of production can begin. Traditional cooling systems only have a single cooling function, and cooling down from a high temperature is time-consuming, often requiring tens of minutes or even longer. This results in long downtime on the production line, severely impacting the overall continuous operating efficiency. Furthermore, the incompatibility between cleaning and cooling functions prevents the system from simultaneously storing cooling capacity during cleaning, leading to a double waste of time and energy.

[0005] Secondly, high-temperature cleaning causes thermal interference to the refrigerant system, affecting the reliability and stability of equipment operation.

[0006] During high-temperature disinfection and cleaning operations, the high-temperature water in the red water evaporator transfers heat to the refrigerant side through the heat exchange tube walls, causing an increase in pressure within the refrigerant pipeline and abnormal refrigerant migration or phase change. Some refrigerant may accumulate locally within the pipeline or even escape to the low-pressure side of the system, resulting in an imbalance in refrigerant distribution. When cleaning is completed and the system is ready to switch back to cooling mode, the abnormal refrigerant condition often leads to problems such as the compressor failing to start normally, mode switching stalling, and a sudden drop in cooling efficiency. This thermal interference not only affects the reliability of equipment operation but may also increase the risk of refrigerant leakage, making it difficult to guarantee the long-term stability of the system.

[0007] Third, the evaporator has an unreasonable structural design, making it prone to scaling and clogging, and difficult to clean and maintain.

[0008] Red water contains blood, grease, impurities, and other substances that easily cause scaling. After long-term operation, residues easily accumulate on the inner wall of the evaporator heat exchange tubes, forming a stubborn scale layer. The thermal resistance of the scale layer is much higher than that of the metal tube wall, resulting in a significant decrease in heat exchange efficiency, reduced cooling capacity, and decreased temperature control accuracy. Traditional evaporators are mostly shell-and-tube structures with small-diameter heat exchange tubes (usually 19mm or 25mm) that are fixed at both ends by tube sheets. Cleaning requires disassembling the pipes or even completely disassembling the evaporator, which is complex, time-consuming, and results in high downtime maintenance costs. Some companies have to extend the cleaning cycle due to the difficulty of cleaning, further aggravating the scaling problem, creating a vicious cycle that ultimately affects the quality of poultry carcass cleaning and the service life of the equipment.

[0009] To address the aforementioned issues, there is an urgent need to develop a new type of refrigeration unit that combines red water cooling and cold storage functions, possesses a high-temperature cleaning and thermal isolation mechanism, and is easy to clean and maintain, in order to improve the operating efficiency, stability, and maintenance convenience of poultry slaughtering and processing production lines. Summary of the Invention

[0010] The purpose of this application is to provide a control method for a dual-function red water cooling and cold storage magnetic levitation unit, which has the advantages of effectively resolving the conflict between high-temperature disinfection and cleaning and cooling functions, significantly shortening downtime, and improving production efficiency and energy utilization.

[0011] This application provides a control method for a dual-function red water cooling and cold storage magnetic levitation unit, the technical solution of which is as follows:

[0012] A control method for a dual-function red water cooling and cold storage magnetic levitation unit, the unit comprising a magnetic levitation compressor, a condenser, a red water falling film evaporator, a cold storage falling film evaporator, a red water pool, and a cold storage water tank; the magnetic levitation compressor, condenser, and red water falling film evaporator are connected by pipelines to form a first refrigeration circuit; the magnetic levitation compressor, condenser, and cold storage falling film evaporator are connected by pipelines to form a second refrigeration circuit; the water-side channel of the red water falling film evaporator is connected to the red water pool to form a red water circulation circuit; the water-side channel of the cold storage falling film evaporator is connected to the cold storage water tank to form a cold storage water circulation circuit; the red water circulation circuit and the cold storage water circulation circuit are connected by a controllable interconnection structure; the method includes the following steps:

[0013] When the red water pool needs to be disinfected and cleaned at high temperature, the first refrigeration circuit is shut off to supply cooling to the red water falling film evaporator, so that the red water falling film evaporator stops cooling, and the red water pool is disinfected and cleaned at high temperature at the same time.

[0014] During the high-temperature disinfection and cleaning of the red water pool, the second refrigeration circuit is turned on to supply cooling to the cold storage falling film evaporator, so that the cold storage falling film evaporator can cool and pre-store the water in the cold storage tank.

[0015] After the red water pool is disinfected and cleaned at high temperature, the low-temperature water in the cold water storage tank is introduced into the red water circulation loop through a controllable connection structure, so that the water temperature of the red water pool drops rapidly.

[0016] Furthermore, this application also proposes that the refrigerant inlet pipe of the red water falling film evaporator is equipped with a first control valve and its refrigerant outlet pipe is equipped with a second control valve; the refrigerant inlet pipe of the cold storage falling film evaporator is equipped with a third control valve and its refrigerant outlet pipe is equipped with a fourth control valve; the controllable connection structure includes a connecting pipe and a connecting valve installed on the connecting pipe;

[0017] In red water mode, open the first and second control valves, and close the third and fourth control valves;

[0018] In cold storage mode, the first and second control valves are closed, and the third and fourth control valves are opened.

[0019] The steps for introducing low-temperature water from the cold water storage tank into the red water circulation loop include: opening the connecting valve.

[0020] Furthermore, this application also proposes that the unit also includes a controller, a first temperature sensor is provided in the red water tank, and a second temperature sensor is provided in the cold water storage tank; the controller responds to an external start command in red water mode or high temperature disinfection and cleaning mode, and automatically controls the opening or closing of the first control valve, the second control valve, the third control valve, the fourth control valve and the connecting valve according to the detection signals of the first temperature sensor and the second temperature sensor.

[0021] Furthermore, this application also proposes that, in red water mode, when the water temperature of the red water pool is between the cooling trigger temperature threshold and the upper limit of the high temperature allowed by the process, the cooling mode is triggered, the magnetic levitation compressor is automatically turned on, and the outlet water temperature of the red water pool is controlled at the set low temperature value by adjusting the operating frequency of the magnetic levitation compressor.

[0022] Furthermore, this application also proposes that the unit further includes a refrigerant pump cooling circuit, which includes a refrigerant pump; the inlet of the refrigerant pump is connected to the outlet of the condenser via a pipeline, and the outlet of the refrigerant pump is connected to the inlet of the motor cooling jacket and / or the inverter cooling jacket of the magnetic levitation compressor via a pipeline, for supplying low-temperature liquid refrigerant to the motor cooling jacket and / or the inverter cooling jacket for cooling; the outlet of the motor cooling jacket and / or the inverter cooling jacket is connected to the refrigerant inlet of the red water falling film evaporator and / or the refrigerant inlet of the cold storage falling film evaporator via a pipeline, so that the refrigerant after heat absorption returns to the refrigeration circuit to participate in the circulation.

[0023] Furthermore, this application also proposes that the unit further includes a hot gas bypass pipeline, which includes a hot gas bypass valve; the inlet end of the hot gas bypass pipeline is connected to the inlet of the condenser, and its outlet end is connected to the refrigerant inlet of the red water falling film evaporator and the refrigerant inlet of the cold storage falling film evaporator through pipelines respectively; the hot gas bypass pipeline is used to bypass part of the high-temperature gaseous refrigerant to the evaporator to achieve low-temperature antifreeze or load regulation.

[0024] Furthermore, this application also proposes that the unit further includes a cut-in system, which includes a first cut-in pipeline and a second cut-in pipeline; the inlet end of the first cut-in pipeline is connected to the exhaust pipe of the magnetic levitation compressor, and its outlet end is connected to the refrigerant inlet of the red water falling film evaporator; the inlet end of the second cut-in pipeline is connected to the exhaust pipe of the magnetic levitation compressor, and its outlet end is connected to the refrigerant inlet of the cold storage falling film evaporator; a first cut-in valve is provided on the first cut-in pipeline, and a second cut-in valve is provided on the second cut-in pipeline; the cut-in system is used to introduce a portion of the high-temperature exhaust gas into the evaporator at the initial stage of startup in order to quickly establish the system pressure differential and stabilize operation.

[0025] Furthermore, this application also proposes that the unit further includes an economizer and an auxiliary electronic expansion valve; the economizer is installed on the pipeline between the condenser outlet and the refrigerant inlet of the red water falling film evaporator and the cold storage falling film evaporator; the economizer has a main circuit and a flash side, the main circuit of the economizer is used to subcool the liquid refrigerant, the flash side inlet of the economizer is connected to the outlet of the auxiliary electronic expansion valve through a pipeline, and the inlet of the auxiliary electronic expansion valve is connected to the inlet end of the main circuit of the economizer or the condenser outlet through a pipeline, for drawing a portion of the liquid refrigerant from the main circuit, throttling it, and then entering the flash side for heat absorption and evaporation; the flash side outlet of the economizer is connected to the intermediate gas injection port of the magnetic levitation compressor through a pipeline, for sending the flash vapor into the compressor to achieve gas injection and enthalpy increase.

[0026] Furthermore, this application proposes that the red-water falling film evaporator includes a shell and multiple water-side heat exchange tubes; each end of the shell is provided with a detachable quick-cleaning head, each quick-cleaning head is constructed as a semi-ring or U-shaped structure, used to connect the ends of two water-side heat exchange tubes to form a turning channel for the water-side medium; multiple quick-cleaning heads are connected to multiple sets of heat exchange tubes at both ends of the shell, so that the water-side medium forms multiple tortuous flows inside the tubes; the detachable connection of the quick-cleaning heads is used to remove them when cleaning is required to expose the ports of the water-side heat exchange tubes for cleaning; the water-side heat exchange tubes are externally threaded toothed tubes.

[0027] Furthermore, this application also proposes that the magnetic levitation compressor has a multi-head parallel structure, including at least two magnetic levitation compressor unit units; the exhaust ports of each magnetic levitation compressor unit unit are connected in parallel and then connected to the inlet of the condenser through pipelines; the suction ports of each magnetic levitation compressor unit unit are connected in parallel and then connected to the refrigerant outlet of the red water falling film evaporator and the refrigerant outlet of the cold storage falling film evaporator through pipelines respectively.

[0028] As can be seen from the above, the control method of the dual-function red water cooling and cold storage magnetic levitation unit provided in this application effectively solves the conflict between high-temperature disinfection and cleaning and the cooling function by stopping the first refrigeration circuit and starting the second refrigeration circuit for cold storage during high-temperature disinfection and cleaning of the red water pool, and introducing low-temperature water for rapid cooling after cleaning. This significantly shortens the downtime and improves production efficiency and energy utilization. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of a dual-function red water cooling and cold storage magnetic levitation unit provided for this application.

[0030] Figure 2 An exploded schematic diagram of a dual-function red water cooling and cold storage magnetic levitation unit provided in this application.

[0031] Figure 3 This application provides a system connection diagram for a dual-function red water cooling and cold storage magnetic levitation unit.

[0032] Figure 4 This is a schematic diagram of the quick-cleaning end cap on a red-water falling film evaporator. Detailed Implementation

[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] In the poultry slaughtering and processing industry, traditional red water cooling systems suffer from several problems during high-temperature disinfection and cleaning. These include conflicts between cleaning and refrigeration functions, leading to poor production continuity; thermal interference with the refrigerant system, affecting equipment reliability and stability; and an improperly designed evaporator structure that is prone to scaling and clogging, making cleaning and maintenance difficult. These issues impact the production line's operational efficiency, stability, and ease of maintenance.

[0036] In response, this embodiment proposes a control method for a dual-function red water cooling and cold storage magnetic levitation unit. For example... Figure 1-4 As shown, the unit includes a magnetic levitation compressor 10, a condenser 20, a red water falling film evaporator 30, a cold storage falling film evaporator 40, a red water tank 50, and a cold storage water tank 60. The magnetic levitation compressor 10, condenser 20, and red water falling film evaporator 30 are connected by pipelines to form a first refrigeration circuit. The magnetic levitation compressor 10, condenser 20, and cold storage falling film evaporator 40 are connected by pipelines to form a second refrigeration circuit. The water-side channel of the red water falling film evaporator 30 is connected to the red water tank 50 to form a red water circulation circuit. The water-side channel of the cold storage falling film evaporator 40 is connected to the cold storage water tank 60 to form a cold storage water circulation circuit. The red water circulation circuit and the cold storage water circulation circuit are connected by a controllable communication structure. The control method includes the following steps:

[0037] When the red water pool 50 needs to be disinfected and cleaned at high temperature, the first refrigeration circuit is shut off to cool the red water falling film evaporator 30, so that the red water falling film evaporator 30 stops cooling, and the red water pool 50 is disinfected and cleaned at high temperature at the same time.

[0038] During the high-temperature disinfection and cleaning of the red water pool 50, the second refrigeration circuit is turned on to supply cooling to the cold storage falling film evaporator 40, so that the cold storage falling film evaporator 40 cools and pre-stores the water in the cold storage water tank 60.

[0039] After the red water pool 50 is disinfected and cleaned at high temperature, the low temperature water in the cold water storage tank 60 is introduced into the red water circulation loop through the controllable connection structure, so that the water temperature of the red water pool 50 drops rapidly.

[0040] For ease of understanding, the following explains some key terms in this embodiment:

[0041] The dual-function red water cooling and cold storage magnetic levitation unit refers to a refrigeration device that integrates red water cooling and cold storage functions. This unit utilizes a magnetic levitation compressor 10 as its core power source. By configuring different evaporators and circulation loops, it cools the red water in the red water tank 50 and, under specific operating conditions, pre-stores the cooled water in the cold storage tank 60, thereby meeting the requirements for red water cooling and system continuity during poultry slaughtering and processing.

[0042] The magnetic levitation compressor 10 is a compressor that uses magnetic levitation bearing technology. This compressor uses magnetic force to support the rotor, avoiding mechanical friction, thereby improving its operating efficiency, controlling operating noise, suppressing operating vibration, extending equipment service life, and providing stable refrigerant compression power for the refrigeration circuit.

[0043] The red water falling film evaporator 30 is a heat exchange device specifically designed for cooling the red water in the red water tank 50. This evaporator absorbs heat through the evaporation of refrigerant on the outside of the heat exchange tubes, thus lowering the temperature of the red water flowing inside the tubes. Its falling film design improves heat exchange efficiency and reduces scaling.

[0044] The cold storage falling film evaporator 40 is a heat exchange device used to cool and store the cold water in the cold storage tank 60. This evaporator operates in a specific mode, cooling the water in the cold storage tank 60 to a low temperature for subsequent use.

[0045] Red water tank 50 is a container used to hold red water to be treated. The red water in the red water tank 50 needs to be cooled to the process temperature during the production process, and the red water needs to be disinfected and cleaned at high temperature and replaced during regular maintenance.

[0046] The cold water storage tank 60 is a container used to store low-temperature water. The water in the cold water storage tank 60 is cooled in cold storage mode, and the stored cold energy can be released when needed to assist other cooling needs.

[0047] The first refrigeration circuit is a refrigerant circulation path formed between the magnetic levitation compressor 10, the condenser 20, and the red water falling film evaporator 30. This circuit is mainly responsible for cooling the red water in the red water pool 50 during normal operation.

[0048] The second refrigeration circuit is the refrigerant circulation path formed between the magnetic levitation compressor 10, the condenser 20, and the cold storage falling film evaporator 40. This circuit is mainly responsible for pre-cooling and storing the water in the cold storage tank 60 in cold storage mode.

[0049] The controllable connection structure is a mechanism that connects the red water circulation loop and the cold water circulation loop. By controlling its opening or closing, this structure enables the transfer of low-temperature water in the cold water storage tank 60 to the red water circulation loop, thereby achieving the purpose of rapidly cooling the red water circulation loop.

[0050] High-temperature disinfection and cleaning refers to the process of treating the Red Water Tank 50 and its related pipelines with high temperatures to kill bacteria, remove deposits, and ensure system hygiene and operational safety. During this process, the water temperature in the Red Water Tank 50 will rise.

[0051] Cooling pre-storage refers to the process of using the unit's cooling capacity to pre-cool the water in the cold water storage tank 60 during the high-temperature disinfection and cleaning of the red water pool 50, thereby storing cold energy for subsequent rapid cooling.

[0052] The control method of this embodiment relates to the configuration and circuit connection of the unit. The unit's magnetic levitation compressor 10, condenser 20, red-water falling film evaporator 30, cold storage falling film evaporator 40, red water tank 50, and cold storage water tank 60 are connected by pipelines to form a complete refrigeration and water circulation system. For example, the magnetic levitation compressor 10 can be configured as a single compressor head to simplify the system structure. The condenser 20 can be air-cooled or water-cooled to adapt to different installation environments. The red-water falling film evaporator 30 and the cold storage falling film evaporator 40 can be plate heat exchangers or shell-and-tube heat exchangers to achieve heat exchange between the refrigerant and water. The first refrigeration circuit and the second refrigeration circuit can share a set of refrigerant pipelines, with the refrigerant flow direction selected by an automatic switching valve.

[0053] The core of this control method lies in its optimized handling of the high-temperature disinfection and cleaning process of the red water tank 50. When the red water tank 50 needs to undergo high-temperature disinfection and cleaning, the first refrigeration circuit is first shut off to cool the red water falling film evaporator 30, causing the red water falling film evaporator 30 to stop refrigeration. This aims to isolate the thermal impact of high-temperature cleaning on the refrigeration circuit and protect the refrigeration equipment. Simultaneously, high-temperature disinfection and cleaning of the red water tank 50 is performed. For example, this can be achieved by stopping the magnetic levitation compressor 10 from supplying cooling to the red water falling film evaporator 30, or by manually closing the valves on the refrigerant pipeline, ensuring that the red water falling film evaporator 30 no longer participates in refrigeration. High-temperature disinfection and cleaning of the red water tank 50 can be carried out using an external heating device or by injecting high-temperature water.

[0054] During the high-temperature disinfection and cleaning of the red water tank 50, this method further utilizes the unit's cooling capacity. Specifically, the second refrigeration circuit is activated to cool the cold storage falling film evaporator 40, allowing the evaporator 40 to pre-store the cooling water in the cold storage tank 60. Thus, while the red water tank 50 is being cleaned, the unit's cooling capacity is effectively utilized, pre-storing the cooling energy in the cold storage tank 60. For example, during cleaning, the magnetic levitation compressor 10 can be automatically activated, and the refrigerant flow direction can be adjusted so that it only supplies cooling to the cold storage falling film evaporator 40, thereby cooling the water in the cold storage tank 60 to a preset low temperature.

[0055] After the high-temperature disinfection and cleaning of the red water pool 50 is completed, in order to quickly resume production, the low-temperature water in the cold water storage tank 60 is introduced into the red water circulation loop through the controllable connection structure, causing the water temperature in the red water pool 50 to drop rapidly. This step utilizes the pre-stored cooling capacity, avoiding the lengthy process of waiting for the unit to cool down from a high-temperature state again. This solution prioritizes the use of the pre-stored low-temperature cold water in the falling film evaporator, achieving a rapid drop in the water temperature of the red water pool 50 through rapid heat exchange, ensuring that the water temperature recovers to the low-temperature range required by the process in the shortest possible time after disinfection. This avoids tissue damage to poultry caused by contact with water with excessive temperature differences, which could affect product quality, while significantly shortening the water temperature recovery time between batches and improving the continuous operation efficiency of the entire production line.

[0056] This control method effectively avoids thermal interference to the refrigeration system during high-temperature disinfection and cleaning in the red water tank 50 by shutting down the red water cooling circuit and simultaneously activating the cold storage circuit for pre-cooling. This ensures the reliability of equipment operation. After cleaning, the low-temperature water in the cold storage tank 60 rapidly lowers the water temperature in the red water tank 50, shortening production waiting time and improving the continuous operation efficiency of the poultry slaughtering and processing production line. This method achieves parallel operation of cleaning and cooling, optimizes energy utilization, and improves the system's response speed under special operating conditions.

[0057] In a further embodiment, the red water falling film evaporator 30 has a first control valve 81 on its refrigerant inlet pipe and a second control valve 82 on its refrigerant outlet pipe; the cold storage falling film evaporator 40 has a third control valve 83 on its refrigerant inlet pipe and a fourth control valve 84 on its refrigerant outlet pipe; the controllable connection structure includes a connecting pipe 71 and a connecting valve 72 disposed on the connecting pipe 71. In red water mode, the first control valve 81 and the second control valve 82 are opened, and the third control valve 83 and the fourth control valve 84 are closed; in cold storage mode, the first control valve 81 and the second control valve 82 are closed, and the third control valve 83 and the fourth control valve 84 are opened; the step of introducing low-temperature water from the cold storage water tank 60 into the red water circulation loop includes: opening the connecting valve 72.

[0058] Specifically, the first control valve 81, the second control valve 82, the third control valve 83, and the fourth control valve 84 are key components used to precisely regulate or cut off the flow of refrigerant in different refrigeration circuits. These control valves can be electronic expansion valves, solenoid valves, shut-off valves, or ball valves, etc., and change their opening degree or on / off state by receiving control signals. The first control valve 81 and the second control valve 82 are respectively installed on the refrigerant inlet and outlet pipes of the red water falling film evaporator 30, and are used to control the entry and exit of refrigerant in the red water falling film evaporator 30. The third control valve 83 and the fourth control valve 84 are respectively installed on the refrigerant inlet and outlet pipes of the cold storage falling film evaporator 40, and are used to control the entry and exit of refrigerant in the cold storage falling film evaporator 40. Through the coordinated control of these valves, precise switching of the refrigerant flow direction can be achieved, ensuring that only the corresponding evaporator participates in refrigeration in a specific mode. The connecting pipe 71 is a physical channel connecting the red water circulation circuit and the cold storage water circulation circuit, used to enable the flow of water medium between the two water circulation circuits when needed. A connecting valve 72 is installed on the connecting pipe 71. Its function is to control the opening or closing of the channel, thereby determining whether to introduce low-temperature water from the cold water storage tank 60 into the red water circulation loop. The connecting valve 72 can be an electric ball valve, a solenoid valve, or a manual valve, etc., and its opening or closing state directly affects the process of introducing low-temperature water.

[0059] In red water mode, by opening the first control valve 81 and the second control valve 82, and closing the third control valve 83 and the fourth control valve 84, the refrigerant flow path can be precisely directed to the red water falling film evaporator 30, thereby achieving the cooling function of the red water tank 50. This configuration ensures that the refrigerant circulates effectively only in the first refrigeration circuit. In cold storage mode, by closing the first control valve 81 and the second control valve 82, and opening the third control valve 83 and the fourth control valve 84, the refrigerant flow path can be precisely directed to the cold storage falling film evaporator 40, thereby achieving the pre-storage function of the cold storage water tank 60. This configuration ensures that the refrigerant circulates effectively only in the second refrigeration circuit. Opening the connecting valve 72 is a key operation to transfer the low-temperature water in the cold storage water tank 60 to the red water circulation circuit. Through this operation, the pre-stored low-temperature water can be introduced into the red water circulation circuit to achieve rapid cooling.

[0060] By introducing a first control valve 81, a second control valve 82, a third control valve 83, a fourth control valve 84, and connecting pipes 71 and connecting valve 72, and by defining their opening and closing logic under different operating modes, this application can achieve precise control and mode switching of the refrigeration circuit. In red water mode, the refrigerant is accurately guided to the red water falling film evaporator 30 to ensure effective cooling of the red water pool 50; in cold storage mode, the refrigerant is guided to the cold storage falling film evaporator 40 to efficiently store cold in the cold storage tank 60. In addition, by opening the connecting valve 72, the low-temperature water in the cold storage tank 60 can be conveniently and effectively introduced into the red water circulation loop, thereby achieving rapid and controlled cooling after the red water pool 50 is disinfected and cleaned at high temperature. This avoids problems such as system instability, increased energy consumption, or low cooling efficiency that may be caused by traditional manual switching or inaccurate control, significantly improving the flexibility, reliability, and energy efficiency of the unit operation.

[0061] In a further embodiment, the unit also includes a controller 90, a first temperature sensor is provided in the red water tank 50, and a second temperature sensor is provided in the cold water storage tank 60; the controller 90 responds to external start commands in red water mode or high-temperature disinfection and cleaning mode, and automatically controls the opening or closing of the first control valve 81, the second control valve 82, the third control valve 83, the fourth control valve 84, and the connecting valve 72 according to the detection signals of the first temperature sensor and the second temperature sensor.

[0062] The controller 90 is the core of the entire control system. It can be a programmable logic controller (PLC), an industrial computer, or an embedded microprocessor system. It is responsible for receiving data from sensors, processing control logic, and sending commands to actuators (such as valves). The controller 90 is configured to monitor the system status in real time and make decisions based on preset control strategies or algorithms.

[0063] The first temperature sensor installed in the red water tank 50 is used to monitor the water temperature in the red water tank 50 in real time. This sensor can be a resistance temperature detector (RTD), thermocouple, or semiconductor temperature sensor, and its selection should ensure sufficient accuracy and stability within the operating temperature range of the red water tank 50. The first temperature sensor transmits the detected temperature signal to the controller 90, serving as an important basis for the controller 90 to make mode judgments and control decisions. The second temperature sensor installed in the cold water storage tank 60 is used to monitor the water temperature in the cold water storage tank 60 in real time. Similar to the first temperature sensor, the second temperature sensor should also have high accuracy and reliability, accurately reflecting the temperature state of the water in the cold water storage tank 60, and transmitting the detection signal to the controller 90.

[0064] The controller 90 responds to external start commands for red water mode or high-temperature disinfection and cleaning mode, meaning that the system operator or the upper control system can issue commands to the controller 90 to enter a specific operating mode through a human-machine interface (HMI), remote control terminal, or preset time program. After receiving these commands, the controller 90 will activate the corresponding control logic and operation sequence.

[0065] The controller 90 automatically controls the opening and closing of the first control valve 81, the second control valve 82, the third control valve 83, the fourth control valve 84, and the connecting valve 72 based on the detection signals from the first and second temperature sensors. This means that the controller 90 can dynamically adjust the state of each valve according to the actual temperature feedback of the red water pool 50 and the cold water storage tank 60. For example, in the high-temperature disinfection and cleaning mode, the controller 90 will ensure that the first control valve 81 and the second control valve 82 are closed, so that the red water falling film evaporator 30 stops cooling; at the same time, according to external commands and the temperature of the cold water storage tank 60, the controller 90 will open the third control valve 83 and the fourth control valve 84, so that the cold water falling film evaporator 40 pre-stores cooling for the cold water storage tank 60. After the red water pool 50 is disinfected and cleaned, the controller 90 determines whether the conditions for rapid cooling are met based on the temperature of the red water pool 50 detected by the first temperature sensor and the temperature of the cold water storage tank 60 detected by the second temperature sensor. It then automatically opens the connecting valve 72 to introduce the low-temperature water from the cold water storage tank 60 into the red water circulation loop, thereby achieving a rapid decrease in the water temperature of the red water pool 50. This automated control based on real-time temperature feedback ensures the accuracy and efficiency of the system operation.

[0066] Through the above technical solution, this application achieves intelligent and automated management of the dual-function red water cooling and cold storage magnetic levitation unit operation mode. The controller 90 can respond to external start commands and, in conjunction with real-time temperature data provided by the first and second temperature sensors, precisely and automatically control the opening and closing of the first control valve 81, the second control valve 82, the third control valve 83, the fourth control valve 84, and the connecting valve 72. This significantly improves the system's ease of operation and efficiency, avoiding errors and delays that may result from manual intervention. Especially after the red water pool 50 has undergone high-temperature disinfection and cleaning, the controller 90 can intelligently determine and automatically open the connecting valve 72 based on the actual temperature of the red water pool 50 and the availability of low-temperature water in the cold storage tank 60, introducing low-temperature water from the cold storage tank 60 into the red water circulation loop in a timely manner. This ensures that the water temperature in the red water pool 50 can quickly and efficiently drop to the target value, greatly shortening the cooling waiting time after disinfection and cleaning, and ensuring rapid process recovery and improved production efficiency. Simultaneously, this automated control also enhances the system's operational reliability and safety.

[0067] In some of the embodiments described above in this application, the focus is mainly on the rapid cooling of the red water tank 50 after high-temperature disinfection and cleaning. However, how to achieve efficient and precise cooling control of the red water tank 50 during daily operation to meet the continuous temperature requirements of the process is not yet clear. A lack of refined cooling mode management may lead to low system operating efficiency or an inability to respond promptly to temperature changes, affecting the stability of the production process.

[0068] To address this, this application further proposes a method for cooling control of the red water pool 50 in red water mode. Red water mode refers to the operating mode of the dual-function red water cooling and cold storage magnetic levitation unit, which primarily provides cooling services to the red water pool 50 under normal operating conditions. In this mode, the core task of the unit is to cool the red water falling film evaporator 30 through the first refrigeration circuit according to the actual temperature requirements of the red water pool 50, thereby reducing the temperature of the water in the red water pool 50 to meet the specific temperature requirements of the production process. When the water temperature of the red water pool 50 is between the cooling trigger temperature threshold and the upper limit of the process-allowed high temperature, the system will trigger the cooling mode. The cooling trigger temperature threshold is a preset lower temperature point; the system only needs to start cooling when the water temperature of the red water pool 50 exceeds this threshold (e.g., when the water temperature of the red water pool 50 is ≥2℃). The upper limit of the process-allowed high temperature is the highest safe temperature that the water temperature of the red water pool 50 cannot exceed. This range defines the effective interval within which the system needs to intervene in cooling, avoiding unnecessary frequent start-stops or insufficient cooling. Once the conditions are met, the system will automatically start the magnetic levitation compressor 10. The magnetic levitation compressor 10 is the core component of the refrigeration circuit. Its automatic start-up means that the system can initiate the refrigeration cycle according to temperature requirements without manual intervention. Its advantages, such as being oil-free, highly efficient, low-noise, and having a wide operating range, are key to achieving intelligent and automated control. Simultaneously, by adjusting the operating frequency of the magnetic levitation compressor 10, stepless or multi-stage adjustment of the cooling capacity can be achieved. When the cooling load of the red water tank 50 changes, the controller 90 can precisely adjust the operating frequency of the magnetic levitation compressor 10 according to the actual load requirements, thereby outputting a matching cooling capacity. This adjustment method enables the system to maintain high-efficiency operation under different loads, avoiding the problems of frequent start-stop or low efficiency under partial loads of traditional fixed-frequency compressors. Finally, the outlet water temperature of the red water tank 50 is controlled at a set low temperature value. This set low temperature value is a target temperature determined according to production process requirements, such as 2°C, to ensure that the temperature of the red water flowing out of the red water falling film evaporator 30 can be stably maintained at no higher than this set value, providing a stable and reliable cooling medium for downstream processes.

[0069] Through the above technical solution, this application can achieve precise and efficient control of the water temperature in the red water tank 50 under red water mode. When the water temperature in the red water tank 50 enters the cooling trigger range, the system can automatically respond and start the magnetic levitation compressor 10, avoiding the lag of manual intervention. Furthermore, by adjusting the operating frequency of the magnetic levitation compressor 10, the system can dynamically adjust the cooling capacity output according to the actual cooling load changes of the red water tank 50, thereby ensuring that the unit always operates in the high-efficiency range and significantly improving energy utilization efficiency. This refined temperature control strategy ensures that the outlet water temperature of the red water tank 50 can be stably maintained at the set low temperature value required by the process, effectively guaranteeing the continuity of the production process and the stability of product quality, and avoiding production interruptions or product defects caused by temperature fluctuations. At the same time, the automatic start-up and shutdown and frequency adjustment of the magnetic levitation compressor 10 also reduce equipment wear and extend its service life.

[0070] like Figure 3 As shown, the unit also includes a refrigerant pump cooling circuit 100, which includes a refrigerant pump 101. The inlet of the refrigerant pump 101 is connected to the outlet of the condenser 20 via a pipeline, and the outlet of the refrigerant pump 101 is connected to the inlet of the motor cooling jacket and / or the inverter cooling jacket of the magnetic levitation compressor 10 via a pipeline, for supplying low-temperature liquid refrigerant to the motor cooling jacket and / or the inverter cooling jacket for cooling. The outlet of the motor cooling jacket and / or the inverter cooling jacket is connected to the refrigerant inlet of the red water falling film evaporator 30 and / or the refrigerant inlet of the cold storage falling film evaporator 40 via a pipeline, so that the refrigerant after heat absorption returns to the refrigeration circuit to participate in the circulation.

[0071] Specifically, the refrigerant pump cooling circuit 100 is an independent auxiliary cooling system whose main function is to provide efficient cooling for the core heat-generating components of the magnetic levitation compressor 10. This circuit utilizes the low-temperature liquid refrigerant in the main refrigeration circuit as the cooling medium, removing heat through forced circulation. The refrigerant pump 101 is the power unit in this cooling circuit, responsible for providing the driving force for refrigerant circulation, ensuring that the refrigerant can overcome pipeline resistance and flow stably and continuously through the components requiring cooling. The refrigerant pump 101 is typically made of low-temperature resistant and corrosion-resistant materials and has sufficient head and flow rate to meet the cooling requirements of the magnetic levitation compressor 10 under different operating conditions.

[0072] The inlet of the refrigerant pump 101 is connected to the outlet of the condenser 20 via a pipeline, meaning that the refrigerant pump cooling circuit 100 directly utilizes the low-temperature liquid refrigerant at the outlet of the condenser 20 in the main refrigeration circuit. The refrigerant at the outlet of the condenser 20 is relatively low in temperature and in a liquid state, making it an ideal cooling medium. This connection method avoids the introduction of additional refrigeration equipment, improves system integration, and fully utilizes the cooling capacity of the main refrigeration circuit. The outlet of the refrigerant pump 101 is connected to the inlet of the motor cooling jacket and / or inverter cooling jacket of the magnetic levitation compressor 10 via a pipeline. The motor cooling jacket and / or inverter cooling jacket are internal channels designed around the motor stator or inverter power module of the magnetic levitation compressor 10, through which the refrigerant flows to absorb the heat generated during operation. By supplying low-temperature liquid refrigerant to these cooling jackets, the heat generated by the motor and / or inverter can be effectively removed, thereby maintaining the temperature of these critical components within a safe operating range and ensuring the stable operation of the compressor.

[0073] After absorbing heat, the refrigerant's temperature may rise, and it may even partially vaporize. It is then discharged through pipes from the outlets of the motor cooling jacket and / or the inverter cooling jacket, and guided back to the refrigerant inlet of the red-water falling film evaporator 30 and / or the refrigerant inlet of the cold storage falling film evaporator 40. This design allows the refrigerant to re-enter the evaporator of the main refrigeration circuit, exchange heat with red water or cold storage water, and be cooled again, thus achieving refrigerant recycling.

[0074] Through the above technical solution, this application can effectively cool the motor and / or inverter of the magnetic levitation compressor 10. The refrigerant pump 101 forces the low-temperature liquid refrigerant from the condenser 20 outlet to the motor cooling jacket and / or inverter cooling jacket, absorbing the heat generated during operation. This ensures that the magnetic levitation compressor 10 operates stably and efficiently under various operating conditions, avoiding performance degradation or malfunctions due to overheating. The refrigerant, after absorbing heat, is guided back to the refrigerant inlet of the red water falling film evaporator 30 and / or the cold storage falling film evaporator 40, allowing its heat to be effectively processed by the main refrigeration circuit and re-participated in the refrigeration cycle, improving the refrigerant utilization efficiency and the overall energy efficiency of the system. This design not only ensures the long-term reliability of the magnetic levitation compressor 10 but also enables the entire dual-function unit to maintain continuous and stable performance output when performing tasks such as red water cooling, cold storage, and high-temperature disinfection and cleaning of the red water tank 50.

[0075] This application further proposes that the unit also includes a hot gas bypass pipeline 110, which includes a hot gas bypass valve 111. The inlet end of the hot gas bypass pipeline 110 is connected to the inlet of the condenser 20, and its outlet end is connected via pipelines to the refrigerant inlet of the red-water falling film evaporator 30 and the refrigerant inlet of the cold storage falling film evaporator 40, respectively. The hot gas bypass pipeline 110 is used to bypass a portion of the high-temperature gaseous refrigerant to the evaporator to achieve low-temperature antifreeze or load regulation.

[0076] Specifically, the hot gas bypass line 110 is a common auxiliary line in refrigeration systems. Its main function is to directly introduce a portion of the high-temperature, high-pressure gaseous refrigerant discharged from the magnetic levitation compressor 10 into the evaporator without passing through the condenser 20 and the throttling device. This line is typically constructed of metal pipe and can withstand the pressure and temperature of the refrigerant. Its inlet end is connected to the inlet of the condenser 20, i.e., the high-pressure side after the discharge of the magnetic levitation compressor 10 and before the condenser 20. Its outlet end is connected via pipes to the refrigerant inlet of the red-water falling film evaporator 30 and the refrigerant inlet of the cold storage falling film evaporator 40, respectively. This connection method allows the high-temperature gaseous refrigerant to directly enter the evaporator and mix with the low-temperature liquid refrigerant inside the evaporator, thereby increasing the temperature and pressure inside the evaporator.

[0077] The hot gas bypass valve 111 is a flow control valve installed on the hot gas bypass line 110, used to precisely control the flow rate of the high-temperature gaseous refrigerant bypassing to the evaporator. This valve can be a manually adjustable valve, an electrically adjustable valve, or an electronic expansion valve. In practical applications, an electronic expansion valve is typically used because it can make precise and continuous adjustments based on system operating parameters (such as evaporation temperature, suction superheat, etc.), thereby achieving fine control of the bypass flow rate. When low-temperature antifreeze or load adjustment is required, the controller 90 will instruct the hot gas bypass valve 111 to open or adjust its opening degree according to preset logic or sensor feedback signals, allowing some high-temperature gaseous refrigerant to enter the evaporator.

[0078] The hot gas bypass line 110 bypasses a portion of the high-temperature gaseous refrigerant to the evaporator, primarily for low-temperature antifreeze or load regulation. Regarding low-temperature antifreeze, when the refrigerant temperature inside the evaporator is too low, approaching or below the freezing point of water, there is a risk of icing, especially in the water-side heat exchange tubes 141. Introducing high-temperature gaseous refrigerant through the hot gas bypass line 110 can raise the refrigerant temperature inside the evaporator, preventing icing on the evaporator surface or the water-side medium, thereby protecting the equipment. For example, when the system detects that the refrigerant temperature at the evaporator outlet is too low, the controller 90 will open the hot gas bypass valve 111 to introduce high-temperature refrigerant and raise the evaporation temperature. Regarding load regulation, when the system is operating under partial load, the cooling capacity of the magnetic levitation compressor 10 may be excessive, leading to excessively low evaporation pressure, or even causing surge in the magnetic levitation compressor 10. By bypassing a portion of the high-temperature gaseous refrigerant to the evaporator, the load on the evaporator can be artificially increased, raising the evaporation pressure. This allows the magnetic levitation compressor 10 to operate under more stable conditions, avoiding low-pressure protection shutdowns and enabling precise regulation of the cooling capacity. This is crucial for maintaining stable and efficient system operation over a wide load range. For example, when the system load decreases and the evaporation pressure drops, the hot gas bypass valve 111 will open appropriately to maintain the evaporation pressure within a safe range.

[0079] Through the above technical solution, this application can effectively solve the problems of evaporator icing risk and load adjustment difficulties that may occur when the refrigeration unit operates at low temperatures or under partial load conditions. When the system faces low-temperature antifreeze requirements, the hot gas bypass valve 111 opens, introducing some high-temperature gaseous refrigerant into the evaporator to increase the evaporation temperature, thereby preventing the water-side medium from freezing and protecting the equipment. At the same time, when the system load is low, by adjusting the opening of the hot gas bypass valve 111, the high-temperature gaseous refrigerant can be precisely bypassed to the evaporator, artificially increasing the evaporator load and increasing the evaporation pressure, so that the magnetic levitation compressor 10 can operate under more stable conditions, avoiding low-pressure protection shutdown, and achieving fine adjustment of the cooling capacity, thereby ensuring stable and efficient operation of the unit over a wide load range, and significantly improving the unit's operational reliability and adaptability.

[0080] In a further embodiment, the unit also includes a cut-in system, comprising a first cut-in pipe 121 and a second cut-in pipe 122. The inlet end of the first cut-in pipe 121 is connected to the exhaust pipe of the magnetic levitation compressor 10, and its outlet end is connected to the refrigerant inlet of the red-water falling film evaporator 30. The inlet end of the second cut-in pipe 122 is connected to the exhaust pipe of the magnetic levitation compressor 10, and its outlet end is connected to the refrigerant inlet of the cold storage falling film evaporator 40. A first cut-in valve 123 is provided on the first cut-in pipe 121, and a second cut-in valve 124 is provided on the second cut-in pipe 122. The cut-in system is used to introduce a portion of the high-temperature exhaust gas into the evaporator during the initial startup phase to quickly establish a system pressure differential and stabilize operation. This cut-in system is an auxiliary loop whose main function is to quickly adjust the internal pressure balance of the system by introducing high-temperature, high-pressure refrigerant during the initial startup of the refrigeration unit, thereby promoting stable compressor operation. The first inlet pipe 121 connects the exhaust pipe of the magnetic levitation compressor 10 to the refrigerant inlet of the red-water falling film evaporator 30, while the second inlet pipe 122 connects the exhaust pipe of the magnetic levitation compressor 10 to the refrigerant inlet of the cold storage falling film evaporator 40. These pipes provide a direct channel for high-temperature exhaust gas to enter the evaporator, bypassing the condenser 20 and the throttling device. A first inlet valve 123 is installed on the first inlet pipe 121, and a second inlet valve 124 is installed on the second inlet pipe 122. These valves are typically solenoid valves or electric valves, precisely controlled by the controller 90 according to the system operating status to determine whether and when to introduce high-temperature exhaust gas into the corresponding evaporator. In the initial stage of unit startup, the system has not yet fully established a stable high and low pressure zone. At this time, by opening the corresponding inlet valve, a portion of the high-temperature, high-pressure gaseous refrigerant discharged from the magnetic levitation compressor 10 is directly sent to the red-water falling film evaporator 30 and / or the cold storage falling film evaporator 40. This operation rapidly increases the pressure inside the evaporator, quickly creating a relatively high pressure on the compressor's suction side and establishing a sufficient pressure difference with the discharge side. The core of this mechanism lies in using the high-temperature, high-pressure refrigerant discharged by the compressor itself to artificially create a higher pressure environment on the evaporator side. Once the evaporator-side pressure increases, the pressure difference between the compressor's suction and discharge ports is quickly established, allowing the compressor to overcome starting resistance and enter a stable operating state more quickly, avoiding surge or inefficient operation caused by insufficient pressure difference.

[0081] Through the above technical solution, during the initial startup of the unit, a portion of the high-temperature gaseous refrigerant discharged from the magnetic levitation compressor 10 can be directly introduced into the refrigerant inlet of the red-water falling film evaporator 30 and / or the cold storage falling film evaporator 40. This operation can rapidly increase the pressure on the evaporator side, thereby quickly establishing a pressure difference between the suction port and the discharge port of the magnetic levitation compressor 10. This allows the magnetic levitation compressor 10 to reach stable operating conditions more quickly, avoiding startup difficulties or unstable operation caused by insufficient pressure difference, significantly shortening the time required for the system to reach normal cooling status, and helping to protect the compressor and extend its service life.

[0082] like Figure 3 As shown, the cold storage magnetic levitation unit also includes an economizer 130 and an auxiliary electronic expansion valve 131. The economizer 130 is installed on the pipeline between the outlet of the condenser 20 and the refrigerant inlets of the red water falling film evaporator 30 and the cold storage falling film evaporator 40. The economizer 130 has a main path and a flash side. The main path of the economizer 130 is used to subcool the liquid refrigerant. The flash side inlet of the economizer 130 is connected to the outlet of the auxiliary electronic expansion valve 131 through a pipeline. The inlet of the auxiliary electronic expansion valve 131 is connected to the outlet end of the main path of the economizer 130 through a pipeline, and is used to draw out a portion of the subcooled liquid refrigerant from the main path, which is then throttled and enters the flash side for heat absorption and evaporation. The flash side outlet of the economizer 130 is connected to the intermediate gas injection port of the magnetic levitation compressor 10 through a pipeline, and is used to send the flash vapor into the compressor to achieve gas injection and enthalpy increase.

[0083] Economist 130 is a high-efficiency heat exchange device. Its core function is to further subcool the high-pressure liquid refrigerant in the main refrigeration circuit before it enters the evaporator through internal heat exchange. Simultaneously, the flash gas generated during this subcooling process is fed into the compressor via intermediate gas injection. Economist 130 can take various forms; for example, it can be a plate heat exchanger, using multiple thin plates to form flow channels for efficient counter-current heat exchange; or it can be a coaxial heat exchanger, using inner and outer tubes to achieve heat exchange between the refrigerant. Its design aims to optimize the refrigeration cycle and improve the system's energy efficiency ratio.

[0084] The auxiliary electronic expansion valve 131 is a throttling device capable of precisely controlling the refrigerant flow rate. Its function is to throttle and reduce the pressure of the high-pressure liquid refrigerant drawn from the main line, causing it to evaporate and absorb heat on the flash side of the economizer 130. This valve is typically driven by a stepper motor and can precisely adjust its opening degree according to changes in system operating parameters (such as temperature and pressure) via a controller 90, thereby achieving fine control of the refrigerant flow rate on the flash side and ensuring that the economizer 130 achieves optimal heat exchange performance under different operating conditions. Besides the stepper motor-driven electronic expansion valve, a solenoid valve with precise flow regulation capabilities or other controllable throttling devices can also be used.

[0085] Economizer 130 is located on the pipeline between the outlet of condenser 20 and the refrigerant inlet of red-water falling film evaporator 30 and cold storage falling film evaporator 40. This location is crucial. It ensures that the high-pressure liquid refrigerant discharged from condenser 20 is subcooled by economizer 130 before entering the evaporator, thereby increasing the cooling potential of the refrigerant entering the evaporator. At the same time, it also provides suitable pressure and temperature conditions for the refrigerant on the flash side of economizer 130 to achieve effective flash evaporation.

[0086] The economizer 130 typically contains two independent flow paths: a main path and a flash vaporization side. The main path carries the high-pressure liquid refrigerant flowing from the condenser 20, which exchanges heat with the low-temperature, low-pressure refrigerant on the flash vaporization side to achieve subcooling of the liquid refrigerant. The flash vaporization side receives a portion of the liquid refrigerant after it has been throttled by the auxiliary electronic expansion valve 131, causing it to evaporate and absorb heat at a lower pressure, generating low-temperature, low-pressure flash vapor. This dual-flow-path design allows the economizer 130 to simultaneously perform the tasks of liquid refrigerant subcooling and flash vaporization generation without interference, synergistically improving system performance.

[0087] The flash-side inlet of the economizer 130 is connected to the outlet of the auxiliary electronic expansion valve 131 via a pipeline. This means that the auxiliary electronic expansion valve 131 throttles and reduces the pressure of the refrigerant entering the flash-side, allowing it to evaporate at a lower pressure and temperature. This connection ensures that the flash-side receives a suitable working fluid state for an effective endothermic evaporation process. The inlet of the auxiliary electronic expansion valve 131 is connected to the outlet of the main circuit of the economizer 130 via a pipeline. This means that a portion of the already subcooled liquid refrigerant in the main circuit is diverted for flash evaporation. This connection maximizes the subcooling effect of the economizer 130, resulting in a lower evaporation temperature on the flash-side, thereby more effectively cooling the main circuit refrigerant, achieving deeper subcooling, and better gas injection and enthalpy enhancement.

[0088] The flash-side outlet of the economizer 130 is connected to the intermediate gas injection port of the magnetic levitation compressor 10 via a pipeline, which is a key step in achieving gas injection and enthalpy enhancement. The low-temperature, low-pressure vapor generated on the flash side is drawn into the compressor and compressed to the intermediate pressure, then mixed with the refrigerant in the main compression process, thereby increasing the compressor's intake and cooling capacity, while reducing the compressor's exhaust temperature, thus improving operating efficiency and reliability.

[0089] Through the above technical solution, this application introduces an economizer 130 and an auxiliary electronic expansion valve 131 into a dual-function red water cooling and cold storage magnetic levitation unit, effectively solving the problems of limited refrigeration efficiency, increased system energy consumption, reduced operational stability, and insufficient refrigerant state optimization under low-temperature or high-load conditions. Specifically, the economizer 130 subcools the high-pressure liquid refrigerant at the outlet of the condenser 20 through its main circuit, significantly improving the refrigeration potential of the refrigerant entering the red water falling film evaporator 30 and the cold storage falling film evaporator 40, enabling the evaporator to absorb more heat, thereby improving the overall refrigeration capacity and efficiency. At the same time, the auxiliary electronic expansion valve 131 precisely controls a portion of the liquid refrigerant drawn from the main circuit outlet of the economizer 130, causing it to evaporate at the flash side of the economizer 130, and the resulting low-temperature, low-pressure flash vapor is sent to the intermediate gas injection port of the magnetic levitation compressor 10. This gas-injection enthalpy-enhancing technology not only increases the effective gas delivery of the compressor and improves the cycle efficiency of the refrigeration system, but also reduces the compressor's discharge temperature, thereby enhancing the reliability and stability of the magnetic levitation compressor 10 over a wide operating range, especially under high pressure ratio or low-temperature evaporation conditions. Furthermore, by optimizing the refrigerant's state in the cycle and reducing ineffective flashover, the refrigerant can participate in the heat exchange process more efficiently, further reducing system energy consumption. Therefore, the solution proposed in this application enables the dual-function red water cooling and cold storage magnetic levitation unit to meet both red water cooling and cold storage requirements while possessing a higher energy efficiency ratio, more stable operating performance, and stronger environmental adaptability.

[0090] like Figure 4 As shown, the red water falling film evaporator 30 includes a shell and multiple water-side heat exchange tubes 141. The shell has detachably connected quick-cleaning heads 140 at both ends. Each quick-cleaning head 140 is constructed as a semi-ring or U-shaped structure to connect the ends of two water-side heat exchange tubes 141, forming a turning channel for the water-side medium. Multiple quick-cleaning heads 140 are connected to multiple sets of heat exchange tubes at both ends of the shell, allowing the water-side medium to flow through the tubes in multiple meandering patterns. The detachable connection of the quick-cleaning heads 140 allows them to be removed when cleaning is required, exposing the ports of the water-side heat exchange tubes 141 for cleaning. The water-side heat exchange tubes 141 are externally threaded toothed tubes.

[0091] Specifically, the red-water falling film evaporator 30, as a key heat exchange device in the refrigeration circuit, has the core function of absorbing heat from the red-water medium through the evaporation of the refrigerant. The shell provides a sealed chamber for the entire heat exchange process, ensuring that the refrigerant and the red-water medium exchange heat in a controlled environment. Multiple water-side heat exchange tubes 141 serve as channels for the flow of the red-water medium and interfaces for heat transfer; their number and arrangement directly affect the heat exchange area and the uniformity of fluid distribution. To facilitate maintenance and cleaning of the water-side heat exchange tubes 141, both ends of the shell are equipped with detachable quick-cleaning end caps 140. This "detachable connection" feature means that they can be separated from the shell by simple operations (such as loosening bolts or clips) without large-scale disassembly of the entire evaporator, significantly simplifying the cleaning process and reducing maintenance difficulty and time.

[0092] Each quick-cleaning end cap 140 is constructed as a semi-annular or U-shaped structure. This geometry effectively connects the ends of two adjacent water-side heat exchange tubes 141, forming a continuous fluid channel. Through this structure, the red water medium, after flowing through one heat exchange tube, can smoothly turn and enter the next heat exchange tube, thus achieving multiple reciprocating flows of the water-side medium within the evaporator. The synergistic effect of multiple quick-cleaning end caps 140 creates a "multi-pass" or "multi-detour" flow path for the water-side medium within the heat exchange tubes of the evaporator. This design extends the residence time of the red water medium within the heat exchange tubes, increasing its heat exchange opportunities with the refrigerant and thus improving heat exchange efficiency. Simultaneously, the detour flow also helps to increase the water-side flow velocity, reduce the laminar boundary layer thickness, and further enhance heat transfer.

[0093] The detachable connection of the quick-cleaning end cap 140 is the core purpose of its design. When scale or deposits form on the inner wall of the heat exchange tubes, simply removing the quick-cleaning end cap 140 directly exposes the inlet and outlet ends of all water-side heat exchange tubes 141. This allows maintenance personnel to use brushes, high-pressure water guns, or other specialized tools to perform physical or chemical cleaning of the inside of the heat exchange tubes, ensuring their cleanliness and restoring their optimal heat exchange performance. Furthermore, the water-side heat exchange tubes 141 are externally threaded toothed tubes. Externally threaded toothed tubes are a type of enhanced heat transfer tube with a helical toothed structure on their outer surface. These teeth increase the outer surface area of ​​the heat exchange tube and disturb the flow of the refrigerant outside the tube, thereby significantly enhancing the heat transfer coefficient on the refrigerant side. Compared to ordinary smooth tubes, externally threaded toothed tubes can provide higher heat exchange efficiency in the same volume, helping to reduce the evaporator volume or provide stronger cooling capacity in the same volume.

[0094] Through the above technical solution, the red water falling film evaporator 30 adopts a detachable quick-cleaning end cap 140, which allows for convenient disassembly of the end cap during high-temperature disinfection cleaning or routine maintenance in the red water tank 50. This directly exposes the ports of the water-side heat exchange tubes 141, enabling rapid and thorough cleaning of the inside of the heat exchange tubes, significantly reducing maintenance time and downtime costs. Simultaneously, the semi-annular or U-shaped end cap design, combined with multiple sets of heat exchange tubes, allows the water-side medium to form multiple meandering flows, effectively extending the heat exchange path and enhancing the heat transfer effect. The use of externally threaded toothed tubes further increases the heat exchange area, strengthens the heat exchange efficiency between the refrigerant outside the tubes and the red water inside, ensures that the unit maintains high-efficiency and stable cooling performance during long-term operation, and effectively addresses the scaling problem that may be caused by the red water medium, improving the reliability and economy of the system.

[0095] In a further preferred embodiment, the magnetic levitation compressor 10 is a multi-compressor parallel structure, comprising at least two magnetic levitation compressor unit units. The multi-compressor parallel structure refers to connecting multiple independent magnetic levitation compressor unit units in parallel via pipelines to collectively provide cooling capacity to the refrigeration system. Each magnetic levitation compressor unit unit typically includes an independent magnetic levitation compressor 10 body, drive motor, frequency converter, and corresponding control module, capable of independent operation or coordinated operation with other units. This structure significantly improves the overall cooling capacity of the system and provides a foundation for energy regulation and system reliability.

[0096] Specifically, the exhaust ports of each magnetic levitation compressor unit are connected in parallel and then piped to the inlet of the condenser 20. This means that the high-temperature, high-pressure gaseous refrigerant discharged from all operating compressor units will converge and enter the condenser 20 for heat release. This parallel connection ensures that the condenser 20 can effectively handle the heat load generated by all compressors and maintain the smooth operation of the refrigeration cycle.

[0097] Meanwhile, the intake ports of each magnetic levitation compressor unit are connected in parallel and then piped to the refrigerant outlets of the red water falling film evaporator 30 and the cold storage falling film evaporator 40, respectively. This connection method allows each compressor unit to draw low-temperature, low-pressure gaseous refrigerant from either the red water falling film evaporator 30 or the cold storage falling film evaporator 40, depending on the current operating mode and load requirements of the system, or to flexibly draw refrigerant from both evaporators simultaneously. This design enables the system to efficiently and flexibly allocate cooling capacity in red water cooling mode, cold storage mode, and cold storage pre-storage mode during red water disinfection.

[0098] By employing the aforementioned technical solution, the magnetic levitation compressor 10 is designed with a multi-compressor parallel structure, significantly enhancing the unit's operational flexibility and reliability. Firstly, the multi-compressor parallel structure enables multi-stage energy regulation. The system can precisely start or stop some magnetic levitation compressor units according to actual load demands, thereby maintaining high operating efficiency over a wide load range. This avoids the problem of frequent start-stop or inefficient operation of a single compressor under partial load, effectively reducing energy consumption. Secondly, this structure provides system redundancy. Even if one magnetic levitation compressor unit fails, other units can continue to operate, ensuring the unit's basic cooling capacity and greatly improving the system's operational reliability and continuity, reducing the risk of downtime due to single-point failures. Furthermore, the multi-compressor parallel structure also makes system maintenance more convenient, allowing for maintenance of individual units without affecting overall operation. During the high-temperature disinfection and cleaning of the red water tank 50, when the second refrigeration circuit is turned on to supply cold storage to the cold storage falling film evaporator 40 for cold storage, the multi-head parallel structure can allocate the refrigeration capacity more flexibly, ensuring that the cold storage process is carried out efficiently, and quickly reducing the water temperature of the red water tank 50 after disinfection, thereby improving the operating efficiency, stability and adaptability of the entire dual-function unit.

[0099] The following example will provide a more detailed explanation of the above technical solution:

[0100] In a poultry slaughtering and processing plant, the red water cooling system requires regular high-temperature disinfection and cleaning to ensure food safety and equipment hygiene. This plant utilizes a dual-function red water cooling and cold storage magnetic levitation unit. The unit includes a magnetic levitation compressor 10, a condenser 20, a red water falling film evaporator 30, a cold storage falling film evaporator 40, a red water pool 50, and a cold storage water tank 60. The magnetic levitation compressor 10, condenser 20, and red water falling film evaporator 30 are connected by piping to form a first refrigeration circuit; the magnetic levitation compressor 10, condenser 20, and cold storage falling film evaporator 40 are connected by piping to form a second refrigeration circuit. The water-side channel of the red water falling film evaporator 30 is connected to the red water pool 50 to form a red water circulation circuit; the water-side channel of the cold storage falling film evaporator 40 is connected to the cold storage water tank 60 to form a cold storage water circulation circuit. The red water circulation circuit and the cold storage water circulation circuit are connected by a controllable interconnection structure.

[0101] During normal production, the unit operates in red water mode. At this time, the controller 90 responds to external start-up commands and, based on the water temperature signal detected by the first temperature sensor in the red water tank 50, automatically controls the first control valve 81 and the second control valve 82 to be open, and the third control valve 83 and the fourth control valve 84 to be closed. The magnetic levitation compressor 10 starts operating, and the high-temperature, high-pressure gaseous refrigerant it discharges enters the condenser 20 to release heat and condense into liquid refrigerant. After throttling, the liquid refrigerant enters the red water falling film evaporator 30 to absorb heat and evaporate, cooling the red water in the red water tank 50. When the water temperature in the red water tank 50 is between the cooling trigger temperature threshold and the upper limit of the process-allowed high temperature, the controller 90 triggers the cooling mode, automatically starts the magnetic levitation compressor 10, and controls the outlet water temperature of the red water tank 50 at a set low temperature value, such as around 1°C, by adjusting the operating frequency of the magnetic levitation compressor 10, to meet the needs of poultry cleaning and pre-cooling. During this process, the refrigerant pump cooling circuit 100 of the unit operates continuously. The refrigerant pump 101 delivers the low-temperature liquid refrigerant from the outlet of the condenser 20 to the motor cooling jacket and inverter cooling jacket of the magnetic levitation compressor 10 to cool the key components. The refrigerant, after absorbing heat, returns to the refrigerant inlet of the red water falling film evaporator 30 to participate in the circulation, ensuring the stable and efficient operation of the magnetic levitation compressor 10. At the same time, the economizer 130 subcools the liquid refrigerant through the main circuit and draws a portion of the liquid refrigerant from the main circuit through the auxiliary electronic expansion valve 131. After throttling, the liquid refrigerant enters the flash side to absorb heat and evaporate. The flash vapor is sent to the intermediate gas injection port of the magnetic levitation compressor 10, realizing gas injection and enthalpy increase, further improving the refrigeration efficiency.

[0102] When the production base needs to perform high-temperature disinfection and cleaning on the red water tank 50, the operator sends an external start command for the high-temperature disinfection and cleaning mode to the controller 90. Upon receiving the command, the controller 90 immediately shuts off the cooling supply from the first refrigeration circuit to the red water falling film evaporator 30. Specifically, this involves closing the first control valve 81 on the refrigerant inlet pipe and the second control valve 82 on the refrigerant outlet pipe of the red water falling film evaporator 30, thus stopping the evaporator's cooling operation. This effectively prevents the high-temperature water from transferring heat to the refrigerant system through the evaporator, solving the problem of thermal interference to the refrigerant system caused by high-temperature cleaning in traditional systems.

[0103] During the high-temperature disinfection and cleaning of the red water tank 50, the water temperature in the red water tank 50 will rise sharply to over 60℃. Simultaneously, the controller 90 automatically activates the second refrigeration circuit to cool the cold storage falling film evaporator 40. Specifically, this is achieved by opening the third control valve 83 on the refrigerant inlet pipe and the fourth control valve 84 on the refrigerant outlet pipe of the cold storage falling film evaporator 40. The magnetic levitation compressor 10 continues to operate, transferring cooling energy to the cold storage falling film evaporator 40, enabling it to pre-store cooling energy in the cold storage water tank 60, lowering the water temperature in the cold storage water tank 60 to a low temperature, such as around 0℃. This design allows the unit to simultaneously store cooling energy during the cleaning of the red water tank 50, avoiding the waste of cooling energy caused by the inability to cool during cleaning in traditional systems, and improving energy efficiency.

[0104] After the high-temperature disinfection and cleaning of the red water tank 50 is completed, the controller 90 determines that the cleaning is finished and prepares for rapid cooling based on the water temperature signal of the red water tank 50 detected by the first temperature sensor and the water temperature signal of the cold water storage tank 60 detected by the second temperature sensor. At this time, the controller 90 introduces the low-temperature water in the cold water storage tank 60 into the red water circulation loop through a controllable connection structure. Specifically, the controller 90 opens the connecting valve 72 set on the connecting pipe 71, allowing the low-temperature water in the cold water storage tank 60 to flow directly into the red water circulation loop and mix with the high-temperature water in the red water tank 50. Because the cold water storage tank 60 pre-stores a large amount of low-temperature water, the water temperature of the red water tank 50 can drop rapidly, reaching the low-temperature range required by the process in a short time. This significantly shortens the waiting time from high-temperature cleaning to resumption of production, solves the problem of poor production continuity in traditional systems, and improves the operating efficiency of the production line.

[0105] Furthermore, the red-water falling film evaporator 30 of this unit adopts a special structure, including a shell and multiple water-side heat exchange tubes 141. The shell has detachable quick-cleaning heads 140 at both ends. These heads are constructed as semi-annular or U-shaped structures to connect the ends of two water-side heat exchange tubes 141, allowing the water-side medium to flow through the tubes in multiple meandering patterns, thus improving heat exchange efficiency. When cleaning is required, the detachable quick-cleaning heads 140 can be easily removed, exposing the ports of the water-side heat exchange tubes 141 for mechanical or chemical cleaning of the inner walls, effectively solving the problems of scaling and clogging in traditional evaporators and the difficulty of cleaning and maintenance. The water-side heat exchange tubes 141 use externally threaded toothed tubes, further enhancing heat exchange performance.

[0106] During the initial startup phase of the unit, the controller 90 can also switch to the system by opening the first switch valve 123 on the first switch pipe 121 or the second switch valve 124 on the second switch pipe 122. This allows some of the high-temperature exhaust from the magnetic levitation compressor 10 to be introduced into the refrigerant inlet of the red water falling film evaporator 30 or the refrigerant inlet of the cold storage falling film evaporator 40, quickly establishing a system pressure differential and stabilizing operation. Under low-temperature antifreeze or load regulation requirements, the hot gas bypass valve 111 on the hot gas bypass pipe 110 can be opened to bypass some of the high-temperature gaseous refrigerant to the evaporator, achieving precise temperature control and antifreeze protection. The unit employs a multi-head parallel structure magnetic levitation compressor 10, comprising at least two magnetic levitation compressor units. The exhaust ports of each unit are connected in parallel to the inlet of the condenser 20, and the suction ports are connected in parallel to the refrigerant outlets of the red water falling film evaporator 30 and the cold storage falling film evaporator 40, respectively, providing flexibility in capacity regulation and operational reliability.

[0107] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A control method for a dual-function red water cooling and cold storage magnetic levitation unit, the unit comprising a magnetic levitation compressor (10), a condenser (20), a red water falling film evaporator (30), a cold storage falling film evaporator (40), a red water pool (50), and a cold storage water tank (60); the magnetic levitation compressor (10), condenser (20), and red water falling film evaporator (30) are connected by pipelines to form a first refrigeration circuit; the magnetic levitation compressor (10), condenser (20), and cold storage falling film evaporator (40) are connected by pipelines to form a second refrigeration circuit; the water-side channel of the red water falling film evaporator (30) is connected to the red water pool (50) to form a red water circulation circuit; the water-side channel of the cold storage falling film evaporator (40) is connected to the cold storage water tank (60) to form a cold storage water circulation circuit; the red water circulation circuit and the cold storage water circulation circuit are connected by a controllable interconnection structure; characterized in that, Includes the following steps: When the red water pool (50) needs to be disinfected and cleaned at high temperature, the first refrigeration circuit is shut off to supply cooling to the red water falling film evaporator (30), so that the red water falling film evaporator (30) stops cooling, and the red water pool (50) is disinfected and cleaned at high temperature at the same time. During the high-temperature disinfection and cleaning of the red water pool (50), the second refrigeration circuit is turned on to supply cooling to the cold storage falling film evaporator (40), so that the cold storage falling film evaporator (40) can pre-store the water in the cold storage water tank (60). After the red water pool (50) is disinfected and cleaned at high temperature, the low temperature water in the cold water storage tank (60) is introduced into the red water circulation loop through the controllable connection structure, so that the water temperature of the red water pool (50) drops rapidly.

2. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The red water falling film evaporator (30) is provided with a first control valve (81) on its refrigerant inlet pipe and a second control valve (82) on its refrigerant outlet pipe; the cold storage falling film evaporator (40) is provided with a third control valve (83) on its refrigerant inlet pipe and a fourth control valve (84) on its refrigerant outlet pipe; the controllable connection structure includes a connection pipe (71) and a connection valve (72) provided on the connection pipe (71); In red water mode, open the first control valve (81) and the second control valve (82), and close the third control valve (83) and the fourth control valve (84). In the cold storage mode, the first control valve (81) and the second control valve (82) are closed, and the third control valve (83) and the fourth control valve (84) are opened. The step of introducing the low-temperature water in the cold storage tank (60) into the red water circulation loop includes: opening the connecting valve (72).

3. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 2, characterized in that, The unit also includes a controller (90), a first temperature sensor is provided in the red water tank (50), and a second temperature sensor is provided in the cold water storage tank (60); the controller (90) responds to the external start command of the red water mode or the high temperature disinfection and cleaning mode, and automatically controls the opening or closing of the first control valve (81), the second control valve (82), the third control valve (83), the fourth control valve (84) and the connecting valve (72) according to the detection signals of the first temperature sensor and the second temperature sensor.

4. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, In the red water mode, when the water temperature of the red water pool (50) is between the cooling trigger temperature threshold and the upper limit of the high temperature allowed by the process, the cooling mode is triggered and the magnetic levitation compressor (10) is automatically turned on. By adjusting the operating frequency of the magnetic levitation compressor (10), the outlet water temperature of the red water pool (50) is controlled at the set low temperature value.

5. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The unit also includes a refrigerant pump cooling circuit (100), which includes a refrigerant pump (101). The inlet of the refrigerant pump (101) is connected to the outlet of the condenser (20) via a pipeline, and the outlet of the refrigerant pump (101) is connected to the inlet of the motor cooling jacket and / or the inverter cooling jacket of the magnetic levitation compressor (10) via a pipeline, for supplying low-temperature liquid refrigerant to the motor cooling jacket and / or the inverter cooling jacket to achieve cooling. The outlet of the motor cooling jacket and / or the inverter cooling jacket is connected to the refrigerant inlet of the red water falling film evaporator (30) and / or the refrigerant inlet of the cold storage falling film evaporator (40) via a pipeline, so that the refrigerant after heat absorption returns to the refrigeration circuit to participate in the circulation.

6. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The unit also includes a hot gas bypass pipeline (110), which includes a hot gas bypass valve (111). The inlet end of the hot gas bypass pipeline (110) is connected to the inlet of the condenser (20), and its outlet end is connected to the refrigerant inlet of the red water falling film evaporator (30) and the refrigerant inlet of the cold storage falling film evaporator (40) through pipelines respectively. The hot gas bypass pipeline (110) is used to bypass part of the high-temperature gaseous refrigerant to the evaporator to achieve low-temperature antifreeze or load regulation.

7. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The unit also includes a cut-in system, which includes a first cut-in pipe (121) and a second cut-in pipe (122). The inlet end of the first cut-in pipe (121) is connected to the exhaust pipe of the magnetic levitation compressor (10), and its outlet end is connected to the refrigerant inlet of the red water falling film evaporator (30). The inlet end of the second cut-in pipe (122) is connected to the exhaust pipe of the magnetic levitation compressor (10), and its outlet end is connected to the refrigerant inlet of the cold storage falling film evaporator (40). A first cut-in valve (123) is provided on the first cut-in pipe (121), and a second cut-in valve (124) is provided on the second cut-in pipe (122). The cut-in system is used to introduce part of the high-temperature exhaust gas into the evaporator at the beginning of startup in order to quickly establish the system pressure difference and stabilize operation.

8. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The unit also includes an economizer (130) and an auxiliary electronic expansion valve (131); the economizer (130) is located on the pipeline between the outlet of the condenser (20) and the refrigerant inlet of the red water falling film evaporator (30) and the cold storage falling film evaporator (40); the economizer (130) has a main line and a flash side, the main line of the economizer (130) is used to subcool the liquid refrigerant, the flash side inlet of the economizer (130) is connected to the outlet of the auxiliary electronic expansion valve (131) through a pipeline, the inlet of the auxiliary electronic expansion valve (131) is connected to the outlet end of the main line of the economizer (130) through a pipeline, and is used to draw out a portion of the liquid refrigerant from the main line and enter the flash side for heat absorption and evaporation after throttling; the flash side outlet of the economizer (130) is connected to the intermediate gas injection port of the magnetic levitation compressor (10) through a pipeline, and is used to send the flash vapor into the compressor to achieve gas injection and enthalpy increase.

9. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The red water falling film evaporator (30) includes a shell and multiple water-side heat exchange tubes (141); the shell is provided with detachable quick-cleaning heads (140) at both ends, each quick-cleaning head (140) is constructed as a semi-ring or U-shaped structure to connect the ends of two water-side heat exchange tubes (141) to form a turning channel for the water-side medium; multiple quick-cleaning heads (140) are connected to multiple sets of heat exchange tubes at both ends of the shell, so that the water-side medium forms multiple tortuous flows in the tubes; the detachable connection of the quick-cleaning heads (140) is used to remove them when cleaning is required to expose the ports of the water-side heat exchange tubes (141) for cleaning; the water-side heat exchange tubes (141) are externally threaded toothed tubes.

10. The control method for a dual-function red water cooling and cold storage magnetic levitation unit according to claim 1, characterized in that, The magnetic levitation compressor (10) is a multi-head parallel structure, including at least two magnetic levitation compressor units; the exhaust ports of each magnetic levitation compressor unit are connected in parallel and then connected to the inlet of the condenser (20) through pipelines; the suction ports of each magnetic levitation compressor unit are connected in parallel and then connected to the refrigerant outlet of the red water falling film evaporator (30) and the refrigerant outlet of the cold storage falling film evaporator (40) through pipelines respectively.

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